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Carbon filtration process and apparatus for removing PCB's and other compounds from wastewater

a carbon filter and wastewater technology, applied in the direction of filtration separation, multi-stage water/sewage treatment, separation process, etc., can solve the problem that the prefiltration before the granular activated carbon treatment provided minimal process benefits, and achieve the effect of saving millions of dollars in capital expenditures, saving an estimated $5 million in capital expenditures, and cost-effectiveness

Inactive Publication Date: 2007-01-02
HUBBELL ROTH & CLARK
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AI Technical Summary

Benefits of technology

This method effectively reduces PCB concentrations below detectable limits, saving millions in capital expenditures by eliminating the need for sand pre-filtration systems and ensuring environmental compliance, thereby improving water quality and supporting urban redevelopment.

Problems solved by technology

As a result of the PCB pilot test, it was determined that prefiltration before the granular activated carbon treatment provided minimal process benefits.

Method used

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  • Carbon filtration process and apparatus for removing PCB's and other compounds from wastewater
  • Carbon filtration process and apparatus for removing PCB's and other compounds from wastewater
  • Carbon filtration process and apparatus for removing PCB's and other compounds from wastewater

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Embodiment Construction

[0020]Referring now to FIGS. 1–2, sanitary sewage (influent) is transported to a wastewater treatment plant (WWTP) through a series of sewers, pumping stations, and interceptors to a raw sewage pumping station, located at the WWTP. In one embodiment of the invention, the raw sewage pumping station contains five pumps which lift the wastewater from deep in the sewer system up into the treatment plant where various unit processes are located to purify the wastewater.

[0021]The first step (step A) in the treatment process involves removal of solids such as the sand and grit contained in the wastewater to create solids-depleted wastewater known as Preliminary Effluent (PrE) and thus protect downstream treatment plant systems from premature failure due to wear from the sand and grit. The solids are removed in tanks called detritors, where the sand and grit is allowed to settle out of the waste stream. Following sand and grit removal, the PrE continues to flow by gravity or pumping to one ...

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Abstract

Process and apparatus for treating wastewater from a sewer system including the steps of: (A) removing solids contained in the influent to create solids-depleted preliminary effluent (PrE) and to protect downstream systems from premature failure due to wear from solid particles; (B) removing suspended solids from the PrE to produce a suspended solids-depleted primary effluent (PE); (C) treating the PE biologically by exposing it to bacteria-supporting media that removes soluble organic material, thereby creating trickling filter effluent (TFE); (D) separating the bacterial organisms by settling to create a secondary effluent (SE); (E) subjecting the SE to tertiary treatment including granular activated carbon pressure filters to remove PCB's and other compounds and create a carbon filter effluent; (F) disinfecting the CFE to create a final effluent (FE); and (G) discharging the FE to a receiving environment, separately settling and disposing the backwash solids in a backwash clarifier.

Description

CROSS-REFERENCE TO RELATED APPLICATION[0001]This new utility application claims the benefit of provisional application Ser. No. 60 / 631,051, filed on Nov. 24, 2004.BACKGROUND OF THE INVENTION[0002]1. Field of the Invention[0003]The invention relates to the process and construction of wastewater treatment plants. More specifically, the invention relates to a system for removing contaminants from wastewater.[0004]2. Background Art[0005]Municipalities are often faced with the challenge of removing polychlorinated biphenyl (PCB) and other organic compounds from the discharge of their aging wastewater treatment facilities. Polychlorinated biphenyl is a man-made compound that was used in the manufacture of transformers, hydraulic oils, paints, and in other products. It has been determined to be a health risk to humans and is seen as a bio-accumulative chemical of concern. The PCB, which may be found in the plant's influent and sometimes in the effluent, must be removed to meet a limitation...

Claims

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Application Information

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Patent Type & Authority Patents(United States)
IPC IPC(8): C02F3/00C02F11/121C02F11/148
CPCC02F9/00C02F1/281C02F1/32C02F3/04C02F2101/363C02F11/121C02F11/14C02F2001/007Y02W10/10C02F11/148
Inventor CHRISTESON, CURT A.
Owner HUBBELL ROTH & CLARK
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